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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

  3.  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * Libav is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with Libav; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /*

  23.  * References

  24.  * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

  28.  * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container

  29.  * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container

  30.  * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container

  31.  *

  32.  * Principle

  33.  * Search for Track numbers which will identify essence element KLV packets.

  34.  * Search for SourcePackage which define tracks which contains Track numbers.

  35.  * Material Package contains tracks with reference to SourcePackage tracks.

  36.  * Search for Descriptors (Picture, Sound) which contains codec info and parameters.

  37.  * Assign Descriptors to correct Tracks.

  38.  *

  39.  * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

  42.  * Simple demuxer, only OP1A supported and some files might not work at all.

  43.  * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1

  44.  */

  45. 

  46. #include <stdint.h>

  47. 

  48. #include "libavutil/aes.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "avformat.h"

  52. #include "internal.h"

  53. #include "mxf.h"

  54. 

  55. typedef enum {

  56.     Header,

  57.     BodyPartition,

  58.     Footer

  59. } MXFPartitionType;

  60. 

  61. typedef enum {

  62.     OP1a = 1,

  63.     OP1b,

  64.     OP1c,

  65.     OP2a,

  66.     OP2b,

  67.     OP2c,

  68.     OP3a,

  69.     OP3b,

  70.     OP3c,

  71.     OPAtom,

  72.     OPSonyOpt,  /* FATE sample, violates the spec in places */

  73. } MXFOP;

  74. 

  75. typedef struct {

  76.     int closed;

  77.     int complete;

  78.     MXFPartitionType type;

  79.     uint64_t previous_partition;

  80.     int index_sid;

  81.     int body_sid;

  82.     int64_t this_partition;

  83.     int64_t essence_offset;         ///< absolute offset of essence

  84.     int64_t essence_length;

  85.     int32_t kag_size;

  86.     int64_t header_byte_count;

  87.     int64_t index_byte_count;

  88.     int pack_length;

  89. } MXFPartition;

  90. 

  91. typedef struct {

  92.     UID uid;

  93.     enum MXFMetadataSetType type;

  94.     UID source_container_ul;

  95. } MXFCryptoContext;

  96. 

  97. typedef struct {

  98.     UID uid;

  99.     enum MXFMetadataSetType type;

  100.     UID source_package_uid;

  101.     UID data_definition_ul;

  102.     int64_t duration;

  103.     int64_t start_position;

  104.     int source_track_id;

  105. } MXFStructuralComponent;

  106. 

  107. typedef struct {

  108.     UID uid;

  109.     enum MXFMetadataSetType type;

  110.     UID data_definition_ul;

  111.     UID *structural_components_refs;

  112.     int structural_components_count;

  113.     int64_t duration;

  114. } MXFSequence;

  115. 

  116. typedef struct {

  117.     UID uid;

  118.     enum MXFMetadataSetType type;

  119.     MXFSequence *sequence; /* mandatory, and only one */

  120.     UID sequence_ref;

  121.     int track_id;

  122.     uint8_t track_number[4];

  123.     AVRational edit_rate;

  124.     int intra_only;

  125. } MXFTrack;

  126. 

  127. typedef struct {

  128.     UID uid;

  129.     enum MXFMetadataSetType type;

  130.     UID essence_container_ul;

  131.     UID essence_codec_ul;

  132.     AVRational sample_rate;

  133.     AVRational aspect_ratio;

  134.     int width;

  135.     int height; /* Field height, not frame height */

  136.     int frame_layout; /* See MXFFrameLayout enum */

  137. #define MXF_TFF 1

  138. #define MXF_BFF 2

  139.     int field_dominance;

  140.     int channels;

  141.     int bits_per_sample;

  142.     unsigned int component_depth;

  143.     unsigned int horiz_subsampling;

  144.     unsigned int vert_subsampling;

  145.     UID *sub_descriptors_refs;

  146.     int sub_descriptors_count;

  147.     int linked_track_id;

  148.     uint8_t *extradata;

  149.     int extradata_size;

  150.     enum AVPixelFormat pix_fmt;

  151. } MXFDescriptor;

  152. 

  153. typedef struct {

  154.     UID uid;

  155.     enum MXFMetadataSetType type;

  156.     int edit_unit_byte_count;

  157.     int index_sid;

  158.     int body_sid;

  159.     AVRational index_edit_rate;

  160.     uint64_t index_start_position;

  161.     uint64_t index_duration;

  162.     int8_t *temporal_offset_entries;

  163.     int *flag_entries;

  164.     uint64_t *stream_offset_entries;

  165.     int nb_index_entries;

  166. } MXFIndexTableSegment;

  167. 

  168. typedef struct {

  169.     UID uid;

  170.     enum MXFMetadataSetType type;

  171.     UID package_uid;

  172.     UID *tracks_refs;

  173.     int tracks_count;

  174.     MXFDescriptor *descriptor; /* only one */

  175.     UID descriptor_ref;

  176. } MXFPackage;

  177. 

  178. typedef struct {

  179.     UID uid;

  180.     enum MXFMetadataSetType type;

  181. } MXFMetadataSet;

  182. 

  183. /* decoded index table */

  184. typedef struct {

  185.     int index_sid;

  186.     int body_sid;

  187.     int nb_ptses;               /* number of PTSes or total duration of index */

  188.     int64_t first_dts;          /* DTS = EditUnit + first_dts */

  189.     int64_t *ptses;             /* maps EditUnit -> PTS */

  190.     int nb_segments;

  191.     MXFIndexTableSegment **segments;    /* sorted by IndexStartPosition */

  192.     AVIndexEntry *fake_index;   /* used for calling ff_index_search_timestamp() */

  193. } MXFIndexTable;

  194. 

  195. typedef struct {

  196.     MXFPartition *partitions;

  197.     unsigned partitions_count;

  198.     MXFOP op;

  199.     UID *packages_refs;

  200.     int packages_count;

  201.     MXFMetadataSet **metadata_sets;

  202.     int metadata_sets_count;

  203.     AVFormatContext *fc;

  204.     struct AVAES *aesc;

  205.     uint8_t *local_tags;

  206.     int local_tags_count;

  207.     uint64_t footer_partition;

  208.     KLVPacket current_klv_data;

  209.     int current_klv_index;

  210.     int run_in;

  211.     MXFPartition *current_partition;

  212.     int parsing_backward;

  213.     int64_t last_forward_tell;

  214.     int last_forward_partition;

  215.     int current_edit_unit;

  216.     int nb_index_tables;

  217.     MXFIndexTable *index_tables;

  218.     int edit_units_per_packet;      ///< how many edit units to read at a time (PCM, OPAtom)

  219. } MXFContext;

  220. 

  221. enum MXFWrappingScheme {

  222.     Frame,

  223.     Clip,

  224. };

  225. 

  226. /* NOTE: klv_offset is not set (-1) for local keys */

  227. typedef int MXFMetadataReadFunc(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset);

  228. 

  229. typedef struct {

  230.     const UID key;

  231.     MXFMetadataReadFunc *read;

  232.     int ctx_size;

  233.     enum MXFMetadataSetType type;

  234. } MXFMetadataReadTableEntry;

  235. 

  236. /* partial keys to match */

  237. static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };

  238. static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };

  239. static const uint8_t mxf_avid_essence_element_key[]        = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0e,0x04,0x03,0x01 };

  240. static const uint8_t mxf_system_item_key[]                 = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x03,0x01,0x04 };

  241. static const uint8_t mxf_klv_key[]                         = { 0x06,0x0e,0x2b,0x34 };

  242. /* complete keys to match */

  243. static const uint8_t mxf_crypto_source_container_ul[]      = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x09,0x06,0x01,0x01,0x02,0x02,0x00,0x00,0x00 };

  244. static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };

  245. static const uint8_t mxf_encrypted_essence_container[]     = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };

  246. static const uint8_t mxf_sony_mpeg4_extradata[]            = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };

  247. 

  248. #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))

  249. 

  250. static int64_t klv_decode_ber_length(AVIOContext *pb)

  251. {

  252.     uint64_t size = avio_r8(pb);

  253.     if (size & 0x80) { /* long form */

  254.         int bytes_num = size & 0x7f;

  255.         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */

  256.         if (bytes_num > 8)

  257.             return AVERROR_INVALIDDATA;

  258.         size = 0;

  259.         while (bytes_num--)

  260.             size = size << 8 | avio_r8(pb);

  261.     }

  262.     return size;

  263. }

  264. 

  265. static int mxf_read_sync(AVIOContext *pb, const uint8_t *key, unsigned size)

  266. {

  267.     int i, b;

  268.     for (i = 0; i < size && !pb->eof_reached; i++) {

  269.         b = avio_r8(pb);

  270.         if (b == key[0])

  271.             i = 0;

  272.         else if (b != key[i])

  273.             i = -1;

  274.     }

  275.     return i == size;

  276. }

  277. 

  278. static int klv_read_packet(KLVPacket *klv, AVIOContext *pb)

  279. {

  280.     if (!mxf_read_sync(pb, mxf_klv_key, 4))

  281.         return AVERROR_INVALIDDATA;

  282.     klv->offset = avio_tell(pb) - 4;

  283.     memcpy(klv->key, mxf_klv_key, 4);

  284.     avio_read(pb, klv->key + 4, 12);

  285.     klv->length = klv_decode_ber_length(pb);

  286.     return klv->length == -1 ? -1 : 0;

  287. }

  288. 

  289. static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)

  290. {

  291.     int i;

  292. 

  293.     for (i = 0; i < s->nb_streams; i++) {

  294.         MXFTrack *track = s->streams[i]->priv_data;

  295.         /* SMPTE 379M 7.3 */

  296.         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))

  297.             return i;

  298.     }

  299.     /* return 0 if only one stream, for OP Atom files with 0 as track number */

  300.     return s->nb_streams == 1 ? 0 : -1;

  301. }

  302. 

  303. /* XXX: use AVBitStreamFilter */

  304. static int mxf_get_d10_aes3_packet(AVIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)

  305. {

  306.     const uint8_t *buf_ptr, *end_ptr;

  307.     uint8_t *data_ptr;

  308.     int i;

  309. 

  310.     if (length > 61444) /* worst case PAL 1920 samples 8 channels */

  311.         return AVERROR_INVALIDDATA;

  312.     length = av_get_packet(pb, pkt, length);

  313.     if (length < 0)

  314.         return length;

  315.     data_ptr = pkt->data;

  316.     end_ptr = pkt->data + length;

  317.     buf_ptr = pkt->data + 4; /* skip SMPTE 331M header */

  318.     for (; end_ptr - buf_ptr >= st->codec->channels * 4; ) {

  319.         for (i = 0; i < st->codec->channels; i++) {

  320.             uint32_t sample = bytestream_get_le32(&buf_ptr);

  321.             if (st->codec->bits_per_coded_sample == 24)

  322.                 bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);

  323.             else

  324.                 bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);

  325.         }

  326.         buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M

  327.     }

  328.     av_shrink_packet(pkt, data_ptr - pkt->data);

  329.     return 0;

  330. }

  331. 

  332. static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)

  333. {

  334.     static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};

  335.     MXFContext *mxf = s->priv_data;

  336.     AVIOContext *pb = s->pb;

  337.     int64_t end = avio_tell(pb) + klv->length;

  338.     int64_t size;

  339.     uint64_t orig_size;

  340.     uint64_t plaintext_size;

  341.     uint8_t ivec[16];

  342.     uint8_t tmpbuf[16];

  343.     int index;

  344. 

  345.     if (!mxf->aesc && s->key && s->keylen == 16) {

  346.         mxf->aesc = av_aes_alloc();

  347.         if (!mxf->aesc)

  348.             return AVERROR(ENOMEM);

  349.         av_aes_init(mxf->aesc, s->key, 128, 1);

  350.     }

  351.     // crypto context

  352.     avio_skip(pb, klv_decode_ber_length(pb));

  353.     // plaintext offset

  354.     klv_decode_ber_length(pb);

  355.     plaintext_size = avio_rb64(pb);

  356.     // source klv key

  357.     klv_decode_ber_length(pb);

  358.     avio_read(pb, klv->key, 16);

  359.     if (!IS_KLV_KEY(klv, mxf_essence_element_key))

  360.         return AVERROR_INVALIDDATA;

  361.     index = mxf_get_stream_index(s, klv);

  362.     if (index < 0)

  363.         return AVERROR_INVALIDDATA;

  364.     // source size

  365.     klv_decode_ber_length(pb);

  366.     orig_size = avio_rb64(pb);

  367.     if (orig_size < plaintext_size)

  368.         return AVERROR_INVALIDDATA;

  369.     // enc. code

  370.     size = klv_decode_ber_length(pb);

  371.     if (size < 32 || size - 32 < orig_size)

  372.         return AVERROR_INVALIDDATA;

  373.     avio_read(pb, ivec, 16);

  374.     avio_read(pb, tmpbuf, 16);

  375.     if (mxf->aesc)

  376.         av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);

  377.     if (memcmp(tmpbuf, checkv, 16))

  378.         av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");

  379.     size -= 32;

  380.     size = av_get_packet(pb, pkt, size);

  381.     if (size < 0)

  382.         return size;

  383.     else if (size < plaintext_size)

  384.         return AVERROR_INVALIDDATA;

  385.     size -= plaintext_size;

  386.     if (mxf->aesc)

  387.         av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],

  388.                      &pkt->data[plaintext_size], size >> 4, ivec, 1);

  389.     av_shrink_packet(pkt, orig_size);

  390.     pkt->stream_index = index;

  391.     avio_skip(pb, end - avio_tell(pb));

  392.     return 0;

  393. }

  394. 

  395. static int mxf_read_primer_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  396. {

  397.     MXFContext *mxf = arg;

  398.     int item_num = avio_rb32(pb);

  399.     int item_len = avio_rb32(pb);

  400. 

  401.     if (item_len != 18) {

  402.         avpriv_request_sample(pb, "Primer pack item length %d", item_len);

  403.         return AVERROR_PATCHWELCOME;

  404.     }

  405.     if (item_num > UINT_MAX / item_len)

  406.         return AVERROR_INVALIDDATA;

  407.     mxf->local_tags_count = item_num;

  408.     mxf->local_tags = av_malloc(item_num*item_len);

  409.     if (!mxf->local_tags)

  410.         return AVERROR(ENOMEM);

  411.     avio_read(pb, mxf->local_tags, item_num*item_len);

  412.     return 0;

  413. }

  414. 

  415. static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  416. {

  417.     MXFContext *mxf = arg;

  418.     MXFPartition *partition;

  419.     UID op;

  420.     uint64_t footer_partition;

  421.     uint32_t nb_essence_containers;

  422.     int err;

  423. 

  424.     if ((err = av_reallocp_array(&mxf->partitions, mxf->partitions_count + 1,

  425.                                  sizeof(*mxf->partitions))) < 0) {

  426.         mxf->partitions_count = 0;

  427.         return err;

  428.     }

  429. 

  430.     if (mxf->parsing_backward) {

  431.         /* insert the new partition pack in the middle

  432.          * this makes the entries in mxf->partitions sorted by offset */

  433.         memmove(&mxf->partitions[mxf->last_forward_partition+1],

  434.                 &mxf->partitions[mxf->last_forward_partition],

  435.                 (mxf->partitions_count - mxf->last_forward_partition)*sizeof(*mxf->partitions));

  436.         partition = mxf->current_partition = &mxf->partitions[mxf->last_forward_partition];

  437.     } else {

  438.         mxf->last_forward_partition++;

  439.         partition = mxf->current_partition = &mxf->partitions[mxf->partitions_count];

  440.     }

  441. 

  442.     memset(partition, 0, sizeof(*partition));

  443.     mxf->partitions_count++;

  444.     partition->pack_length = avio_tell(pb) - klv_offset + size;

  445. 

  446.     switch(uid[13]) {

  447.     case 2:

  448.         partition->type = Header;

  449.         break;

  450.     case 3:

  451.         partition->type = BodyPartition;

  452.         break;

  453.     case 4:

  454.         partition->type = Footer;

  455.         break;

  456.     default:

  457.         av_log(mxf->fc, AV_LOG_ERROR, "unknown partition type %i\n", uid[13]);

  458.         return AVERROR_INVALIDDATA;

  459.     }

  460. 

  461.     /* consider both footers to be closed (there is only Footer and CompleteFooter) */

  462.     partition->closed = partition->type == Footer || !(uid[14] & 1);

  463.     partition->complete = uid[14] > 2;

  464.     avio_skip(pb, 4);

  465.     partition->kag_size = avio_rb32(pb);

  466.     partition->this_partition = avio_rb64(pb);

  467.     partition->previous_partition = avio_rb64(pb);

  468.     footer_partition = avio_rb64(pb);

  469.     partition->header_byte_count = avio_rb64(pb);

  470.     partition->index_byte_count = avio_rb64(pb);

  471.     partition->index_sid = avio_rb32(pb);

  472.     avio_skip(pb, 8);

  473.     partition->body_sid = avio_rb32(pb);

  474.     avio_read(pb, op, sizeof(UID));

  475.     nb_essence_containers = avio_rb32(pb);

  476. 

  477.     /* some files don'thave FooterPartition set in every partition */

  478.     if (footer_partition) {

  479.         if (mxf->footer_partition && mxf->footer_partition != footer_partition) {

  480.             av_log(mxf->fc, AV_LOG_ERROR,

  481.                    "inconsistent FooterPartition value: %"PRIu64" != %"PRIu64"\n",

  482.                    mxf->footer_partition, footer_partition);

  483.         } else {

  484.             mxf->footer_partition = footer_partition;

  485.         }

  486.     }

  487. 

  488.     av_dlog(mxf->fc,

  489.             "PartitionPack: ThisPartition = 0x%"PRIX64

  490.             ", PreviousPartition = 0x%"PRIX64", "

  491.             "FooterPartition = 0x%"PRIX64", IndexSID = %i, BodySID = %i\n",

  492.             partition->this_partition,

  493.             partition->previous_partition, footer_partition,

  494.             partition->index_sid, partition->body_sid);

  495. 

  496.     /* sanity check PreviousPartition if set */

  497.     if (partition->previous_partition &&

  498.         mxf->run_in + partition->previous_partition >= klv_offset) {

  499.         av_log(mxf->fc, AV_LOG_ERROR,

  500.                "PreviousPartition points to this partition or forward\n");

  501.         return AVERROR_INVALIDDATA;

  502.     }

  503. 

  504.     if      (op[12] == 1 && op[13] == 1) mxf->op = OP1a;

  505.     else if (op[12] == 1 && op[13] == 2) mxf->op = OP1b;

  506.     else if (op[12] == 1 && op[13] == 3) mxf->op = OP1c;

  507.     else if (op[12] == 2 && op[13] == 1) mxf->op = OP2a;

  508.     else if (op[12] == 2 && op[13] == 2) mxf->op = OP2b;

  509.     else if (op[12] == 2 && op[13] == 3) mxf->op = OP2c;

  510.     else if (op[12] == 3 && op[13] == 1) mxf->op = OP3a;

  511.     else if (op[12] == 3 && op[13] == 2) mxf->op = OP3b;

  512.     else if (op[12] == 3 && op[13] == 3) mxf->op = OP3c;

  513.     else if (op[12] == 64&& op[13] == 1) mxf->op = OPSonyOpt;

  514.     else if (op[12] == 0x10) {

  515.         /* SMPTE 390m: "There shall be exactly one essence container"

  516.          * The following block deals with files that violate this, namely:

  517.          * 2011_DCPTEST_24FPS.V.mxf - two ECs, OP1a

  518.          * abcdefghiv016f56415e.mxf - zero ECs, OPAtom, output by Avid AirSpeed */

  519.         if (nb_essence_containers != 1) {

  520.             MXFOP op = nb_essence_containers ? OP1a : OPAtom;

  521. 

  522.             /* only nag once */

  523.             if (!mxf->op)

  524.                 av_log(mxf->fc, AV_LOG_WARNING,

  525.                        "\"OPAtom\" with %u ECs - assuming %s\n",

  526.                        nb_essence_containers,

  527.                        op == OP1a ? "OP1a" : "OPAtom");

  528. 

  529.             mxf->op = op;

  530.         } else

  531.             mxf->op = OPAtom;

  532.     } else {

  533.         av_log(mxf->fc, AV_LOG_ERROR, "unknown operational pattern: %02xh %02xh - guessing OP1a\n", op[12], op[13]);

  534.         mxf->op = OP1a;

  535.     }

  536. 

  537.     if (partition->kag_size <= 0 || partition->kag_size > (1 << 20)) {

  538.         av_log(mxf->fc, AV_LOG_WARNING, "invalid KAGSize %i - guessing ", partition->kag_size);

  539. 

  540.         if (mxf->op == OPSonyOpt)

  541.             partition->kag_size = 512;

  542.         else

  543.             partition->kag_size = 1;

  544. 

  545.         av_log(mxf->fc, AV_LOG_WARNING, "%i\n", partition->kag_size);

  546.     }

  547. 

  548.     return 0;

  549. }

  550. 

  551. static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)

  552. {

  553.     int err;

  554. 

  555.     if ((err = av_reallocp_array(&mxf->metadata_sets, mxf->metadata_sets_count + 1,

  556.                                  sizeof(*mxf->metadata_sets))) < 0) {

  557.         mxf->metadata_sets_count = 0;

  558.         return err;

  559.     }

  560.     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;

  561.     mxf->metadata_sets_count++;

  562.     return 0;

  563. }

  564. 

  565. static int mxf_read_cryptographic_context(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  566. {

  567.     MXFCryptoContext *cryptocontext = arg;

  568.     if (size != 16)

  569.         return AVERROR_INVALIDDATA;

  570.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

  571.         avio_read(pb, cryptocontext->source_container_ul, 16);

  572.     return 0;

  573. }

  574. 

  575. static int mxf_read_content_storage(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  576. {

  577.     MXFContext *mxf = arg;

  578.     switch (tag) {

  579.     case 0x1901:

  580.         mxf->packages_count = avio_rb32(pb);

  581.         if (mxf->packages_count >= UINT_MAX / sizeof(UID))

  582.             return AVERROR_INVALIDDATA;

  583.         mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));

  584.         if (!mxf->packages_refs)

  585.             return AVERROR(ENOMEM);

  586.         avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */

  587.         avio_read(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));

  588.         break;

  589.     }

  590.     return 0;

  591. }

  592. 

  593. static int mxf_read_source_clip(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  594. {

  595.     MXFStructuralComponent *source_clip = arg;

  596.     switch(tag) {

  597.     case 0x0202:

  598.         source_clip->duration = avio_rb64(pb);

  599.         break;

  600.     case 0x1201:

  601.         source_clip->start_position = avio_rb64(pb);

  602.         break;

  603.     case 0x1101:

  604.         /* UMID, only get last 16 bytes */

  605.         avio_skip(pb, 16);

  606.         avio_read(pb, source_clip->source_package_uid, 16);

  607.         break;

  608.     case 0x1102:

  609.         source_clip->source_track_id = avio_rb32(pb);

  610.         break;

  611.     }

  612.     return 0;

  613. }

  614. 

  615. static int mxf_read_material_package(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  616. {

  617.     MXFPackage *package = arg;

  618.     switch(tag) {

  619.     case 0x4403:

  620.         package->tracks_count = avio_rb32(pb);

  621.         if (package->tracks_count >= UINT_MAX / sizeof(UID))

  622.             return AVERROR_INVALIDDATA;

  623.         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));

  624.         if (!package->tracks_refs)

  625.             return AVERROR(ENOMEM);

  626.         avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */

  627.         avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));

  628.         break;

  629.     }

  630.     return 0;

  631. }

  632. 

  633. static int mxf_read_track(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  634. {

  635.     MXFTrack *track = arg;

  636.     switch(tag) {

  637.     case 0x4801:

  638.         track->track_id = avio_rb32(pb);

  639.         break;

  640.     case 0x4804:

  641.         avio_read(pb, track->track_number, 4);

  642.         break;

  643.     case 0x4B01:

  644.         track->edit_rate.num = avio_rb32(pb);

  645.         track->edit_rate.den = avio_rb32(pb);

  646.         break;

  647.     case 0x4803:

  648.         avio_read(pb, track->sequence_ref, 16);

  649.         break;

  650.     }

  651.     return 0;

  652. }

  653. 

  654. static int mxf_read_sequence(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  655. {

  656.     MXFSequence *sequence = arg;

  657.     switch(tag) {

  658.     case 0x0202:

  659.         sequence->duration = avio_rb64(pb);

  660.         break;

  661.     case 0x0201:

  662.         avio_read(pb, sequence->data_definition_ul, 16);

  663.         break;

  664.     case 0x1001:

  665.         sequence->structural_components_count = avio_rb32(pb);

  666.         if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))

  667.             return AVERROR_INVALIDDATA;

  668.         sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));

  669.         if (!sequence->structural_components_refs)

  670.             return AVERROR(ENOMEM);

  671.         avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */

  672.         avio_read(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));

  673.         break;

  674.     }

  675.     return 0;

  676. }

  677. 

  678. static int mxf_read_source_package(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  679. {

  680.     MXFPackage *package = arg;

  681.     switch(tag) {

  682.     case 0x4403:

  683.         package->tracks_count = avio_rb32(pb);

  684.         if (package->tracks_count >= UINT_MAX / sizeof(UID))

  685.             return AVERROR_INVALIDDATA;

  686.         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));

  687.         if (!package->tracks_refs)

  688.             return AVERROR(ENOMEM);

  689.         avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */

  690.         avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));

  691.         break;

  692.     case 0x4401:

  693.         /* UMID, only get last 16 bytes */

  694.         avio_skip(pb, 16);

  695.         avio_read(pb, package->package_uid, 16);

  696.         break;

  697.     case 0x4701:

  698.         avio_read(pb, package->descriptor_ref, 16);

  699.         break;

  700.     }

  701.     return 0;

  702. }

  703. 

  704. static int mxf_read_index_entry_array(AVIOContext *pb, MXFIndexTableSegment *segment)

  705. {

  706.     int i, length;

  707. 

  708.     segment->nb_index_entries = avio_rb32(pb);

  709.     if (!segment->nb_index_entries)

  710.         return 0;

  711.     else if (segment->nb_index_entries < 0 ||

  712.              segment->nb_index_entries >

  713.              (INT_MAX / sizeof(*segment->stream_offset_entries)))

  714.         return AVERROR(ENOMEM);

  715. 

  716.     length = avio_rb32(pb);

  717. 

  718.     segment->temporal_offset_entries = av_mallocz(segment->nb_index_entries *

  719.                                  sizeof(*segment->temporal_offset_entries));

  720.     segment->flag_entries            = av_mallocz(segment->nb_index_entries *

  721.                                  sizeof(*segment->flag_entries));

  722.     segment->stream_offset_entries   = av_mallocz(segment->nb_index_entries *

  723.                                  sizeof(*segment->stream_offset_entries));

  724. 

  725.     if (!segment->flag_entries || !segment->stream_offset_entries ||

  726.         !segment->temporal_offset_entries) {

  727.         av_freep(&segment->flag_entries);

  728.         av_freep(&segment->stream_offset_entries);

  729.         av_freep(&segment->temporal_offset_entries);

  730.         return AVERROR(ENOMEM);

  731.     }

  732. 

  733.     for (i = 0; i < segment->nb_index_entries; i++) {

  734.         segment->temporal_offset_entries[i] = avio_r8(pb);

  735.         avio_r8(pb);                                        /* KeyFrameOffset */

  736.         segment->flag_entries[i] = avio_r8(pb);

  737.         segment->stream_offset_entries[i] = avio_rb64(pb);

  738.         avio_skip(pb, length - 11);

  739.     }

  740.     return 0;

  741. }

  742. 

  743. static int mxf_read_index_table_segment(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  744. {

  745.     MXFIndexTableSegment *segment = arg;

  746.     switch(tag) {

  747.     case 0x3F05:

  748.         segment->edit_unit_byte_count = avio_rb32(pb);

  749.         av_dlog(NULL, "EditUnitByteCount %d\n", segment->edit_unit_byte_count);

  750.         break;

  751.     case 0x3F06:

  752.         segment->index_sid = avio_rb32(pb);

  753.         av_dlog(NULL, "IndexSID %d\n", segment->index_sid);

  754.         break;

  755.     case 0x3F07:

  756.         segment->body_sid = avio_rb32(pb);

  757.         av_dlog(NULL, "BodySID %d\n", segment->body_sid);

  758.         break;

  759.     case 0x3F0A:

  760.         av_dlog(NULL, "IndexEntryArray found\n");

  761.         return mxf_read_index_entry_array(pb, segment);

  762.     case 0x3F0B:

  763.         segment->index_edit_rate.num = avio_rb32(pb);

  764.         segment->index_edit_rate.den = avio_rb32(pb);

  765.         av_dlog(NULL, "IndexEditRate %d/%d\n", segment->index_edit_rate.num,

  766.                 segment->index_edit_rate.den);

  767.         break;

  768.     case 0x3F0C:

  769.         segment->index_start_position = avio_rb64(pb);

  770.         av_dlog(NULL, "IndexStartPosition %"PRId64"\n", segment->index_start_position);

  771.         break;

  772.     case 0x3F0D:

  773.         segment->index_duration = avio_rb64(pb);

  774.         av_dlog(NULL, "IndexDuration %"PRId64"\n", segment->index_duration);

  775.         break;

  776.     }

  777.     return 0;

  778. }

  779. 

  780. static void mxf_read_pixel_layout(AVIOContext *pb, MXFDescriptor *descriptor)

  781. {

  782.     int code, value, ofs = 0;

  783.     char layout[16] = {0};

  784. 

  785.     do {

  786.         code = avio_r8(pb);

  787.         value = avio_r8(pb);

  788.         av_dlog(NULL, "pixel layout: code %#x\n", code);

  789. 

  790.         if (ofs < 16) {

  791.             layout[ofs++] = code;

  792.             layout[ofs++] = value;

  793.         }

  794.     } while (code != 0); /* SMPTE 377M E.2.46 */

  795. 

  796.     ff_mxf_decode_pixel_layout(layout, &descriptor->pix_fmt);

  797. }

  798. 

  799. static int mxf_read_generic_descriptor(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  800. {

  801.     MXFDescriptor *descriptor = arg;

  802.     descriptor->pix_fmt = AV_PIX_FMT_NONE;

  803.     switch(tag) {

  804.     case 0x3F01:

  805.         descriptor->sub_descriptors_count = avio_rb32(pb);

  806.         if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))

  807.             return AVERROR_INVALIDDATA;

  808.         descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));

  809.         if (!descriptor->sub_descriptors_refs)

  810.             return AVERROR(ENOMEM);

  811.         avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */

  812.         avio_read(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));

  813.         break;

  814.     case 0x3004:

  815.         avio_read(pb, descriptor->essence_container_ul, 16);

  816.         break;

  817.     case 0x3006:

  818.         descriptor->linked_track_id = avio_rb32(pb);

  819.         break;

  820.     case 0x3201: /* PictureEssenceCoding */

  821.         avio_read(pb, descriptor->essence_codec_ul, 16);

  822.         break;

  823.     case 0x3203:

  824.         descriptor->width = avio_rb32(pb);

  825.         break;

  826.     case 0x3202:

  827.         descriptor->height = avio_rb32(pb);

  828.         break;

  829.     case 0x320C:

  830.         descriptor->frame_layout = avio_r8(pb);

  831.         break;

  832.     case 0x320E:

  833.         descriptor->aspect_ratio.num = avio_rb32(pb);

  834.         descriptor->aspect_ratio.den = avio_rb32(pb);

  835.         break;

  836.     case 0x3212:

  837.         descriptor->field_dominance = avio_r8(pb);

  838.         break;

  839.     case 0x3301:

  840.         descriptor->component_depth = avio_rb32(pb);

  841.         break;

  842.     case 0x3302:

  843.         descriptor->horiz_subsampling = avio_rb32(pb);

  844.         break;

  845.     case 0x3308:

  846.         descriptor->vert_subsampling = avio_rb32(pb);

  847.         break;

  848.     case 0x3D03:

  849.         descriptor->sample_rate.num = avio_rb32(pb);

  850.         descriptor->sample_rate.den = avio_rb32(pb);

  851.         break;

  852.     case 0x3D06: /* SoundEssenceCompression */

  853.         avio_read(pb, descriptor->essence_codec_ul, 16);

  854.         break;

  855.     case 0x3D07:

  856.         descriptor->channels = avio_rb32(pb);

  857.         break;

  858.     case 0x3D01:

  859.         descriptor->bits_per_sample = avio_rb32(pb);

  860.         break;

  861.     case 0x3401:

  862.         mxf_read_pixel_layout(pb, descriptor);

  863.         break;

  864.     default:

  865.         /* Private uid used by SONY C0023S01.mxf */

  866.         if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {

  867.             av_free(descriptor->extradata);

  868.             descriptor->extradata_size = 0;

  869.             descriptor->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);

  870.             if (!descriptor->extradata)

  871.                 return AVERROR(ENOMEM);

  872.             descriptor->extradata_size = size;

  873.             avio_read(pb, descriptor->extradata, size);

  874.         }

  875.         break;

  876.     }

  877.     return 0;

  878. }

  879. 

  880. /*

  881.  * Match an uid independently of the version byte and up to len common bytes

  882.  * Returns: boolean

  883.  */

  884. static int mxf_match_uid(const UID key, const UID uid, int len)

  885. {

  886.     int i;

  887.     for (i = 0; i < len; i++) {

  888.         if (i != 7 && key[i] != uid[i])

  889.             return 0;

  890.     }

  891.     return 1;

  892. }

  893. 

  894. static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)

  895. {

  896.     while (uls->uid[0]) {

  897.         if(mxf_match_uid(uls->uid, *uid, uls->matching_len))

  898.             break;

  899.         uls++;

  900.     }

  901.     return uls;

  902. }

  903. 

  904. static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)

  905. {

  906.     int i;

  907. 

  908.     if (!strong_ref)

  909.         return NULL;

  910.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  911.         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&

  912.             (type == AnyType || mxf->metadata_sets[i]->type == type)) {

  913.             return mxf->metadata_sets[i];

  914.         }

  915.     }

  916.     return NULL;

  917. }

  918. 

  919. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  920.     // video essence container uls

  921.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  922.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    AV_CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  923.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x05,0x00,0x00 }, 14,   AV_CODEC_ID_RAWVIDEO }, /* Uncompressed Picture */

  924.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },

  925. };

  926. 

  927. /* EC ULs for intra-only formats */

  928. static const MXFCodecUL mxf_intra_only_essence_container_uls[] = {

  929.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x00,0x00 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MXF-GC SMPTE D-10 Mappings */

  930.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },

  931. };

  932. 

  933. /* intra-only PictureEssenceCoding ULs, where no corresponding EC UL exists */

  934. static const MXFCodecUL mxf_intra_only_picture_essence_coding_uls[] = {

  935.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x00,0x00 }, 14,       AV_CODEC_ID_H264 }, /* H.264/MPEG-4 AVC Intra Profiles */

  936.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 }, 14,   AV_CODEC_ID_JPEG2000 }, /* JPEG2000 Codestream */

  937.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },

  938. };

  939. 

  940. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  941.     // sound essence container uls

  942.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, AV_CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  943.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       AV_CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */

  944.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, AV_CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */

  945.     { { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0xFF,0x4B,0x46,0x41,0x41,0x00,0x0D,0x4D,0x4F }, 14, AV_CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */

  946.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },

  947. };

  948. 

  949. static int mxf_get_sorted_table_segments(MXFContext *mxf, int *nb_sorted_segments, MXFIndexTableSegment ***sorted_segments)

  950. {

  951.     int i, j, nb_segments = 0;

  952.     MXFIndexTableSegment **unsorted_segments;

  953.     int last_body_sid = -1, last_index_sid = -1, last_index_start = -1;

  954. 

  955.     /* count number of segments, allocate arrays and copy unsorted segments */

  956.     for (i = 0; i < mxf->metadata_sets_count; i++)

  957.         if (mxf->metadata_sets[i]->type == IndexTableSegment)

  958.             nb_segments++;

  959. 

  960.     if (!nb_segments)

  961.         return AVERROR_INVALIDDATA;

  962. 

  963.     *sorted_segments  = av_mallocz(nb_segments * sizeof(**sorted_segments));

  964.     unsorted_segments = av_mallocz(nb_segments * sizeof(*unsorted_segments));

  965.     if (!*sorted_segments || !unsorted_segments) {

  966.         av_freep(sorted_segments);

  967.         av_free(unsorted_segments);

  968.         return AVERROR(ENOMEM);

  969.     }

  970. 

  971.     for (i = j = 0; i < mxf->metadata_sets_count; i++)

  972.         if (mxf->metadata_sets[i]->type == IndexTableSegment)

  973.             unsorted_segments[j++] = (MXFIndexTableSegment*)mxf->metadata_sets[i];

  974. 

  975.     *nb_sorted_segments = 0;

  976. 

  977.     /* sort segments by {BodySID, IndexSID, IndexStartPosition}, remove duplicates while we're at it */

  978.     for (i = 0; i < nb_segments; i++) {

  979.         int best = -1, best_body_sid = -1, best_index_sid = -1, best_index_start = -1;

  980.         uint64_t best_index_duration = 0;

  981. 

  982.         for (j = 0; j < nb_segments; j++) {

  983.             MXFIndexTableSegment *s = unsorted_segments[j];

  984. 

  985.             /* Require larger BosySID, IndexSID or IndexStartPosition then the previous entry. This removes duplicates.

  986.              * We want the smallest values for the keys than what we currently have, unless this is the first such entry this time around.

  987.              * If we come across an entry with the same IndexStartPosition but larger IndexDuration, then we'll prefer it over the one we currently have.

  988.              */

  989.             if ((i == 0     || s->body_sid > last_body_sid || s->index_sid > last_index_sid || s->index_start_position > last_index_start) &&

  990.                 (best == -1 || s->body_sid < best_body_sid || s->index_sid < best_index_sid || s->index_start_position < best_index_start ||

  991.                 (s->index_start_position == best_index_start && s->index_duration > best_index_duration))) {

  992.                 best             = j;

  993.                 best_body_sid    = s->body_sid;

  994.                 best_index_sid   = s->index_sid;

  995.                 best_index_start = s->index_start_position;

  996.                 best_index_duration = s->index_duration;

  997.             }

  998.         }

  999. 

  1000.         /* no suitable entry found -> we're done */

  1001.         if (best == -1)

  1002.             break;

  1003. 

  1004.         (*sorted_segments)[(*nb_sorted_segments)++] = unsorted_segments[best];

  1005.         last_body_sid    = best_body_sid;

  1006.         last_index_sid   = best_index_sid;

  1007.         last_index_start = best_index_start;

  1008.     }

  1009. 

  1010.     av_free(unsorted_segments);

  1011. 

  1012.     return 0;

  1013. }

  1014. 

  1015. /**

  1016.  * Computes the absolute file offset of the given essence container offset

  1017.  */

  1018. static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)

  1019. {

  1020.     int x;

  1021.     int64_t offset_in = offset;     /* for logging */

  1022. 

  1023.     for (x = 0; x < mxf->partitions_count; x++) {

  1024.         MXFPartition *p = &mxf->partitions[x];

  1025. 

  1026.         if (p->body_sid != body_sid)

  1027.             continue;

  1028. 

  1029.         if (offset < p->essence_length || !p->essence_length) {

  1030.             *offset_out = p->essence_offset + offset;

  1031.             return 0;

  1032.         }

  1033. 

  1034.         offset -= p->essence_length;

  1035.     }

  1036. 

  1037.     av_log(mxf->fc, AV_LOG_ERROR,

  1038.            "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",

  1039.            offset_in, body_sid);

  1040. 

  1041.     return AVERROR_INVALIDDATA;

  1042. }

  1043. 

  1044. /**

  1045.  * Returns the end position of the essence container with given BodySID, or zero if unknown

  1046.  */

  1047. static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)

  1048. {

  1049.     int x;

  1050.     int64_t ret = 0;

  1051. 

  1052.     for (x = 0; x < mxf->partitions_count; x++) {

  1053.         MXFPartition *p = &mxf->partitions[x];

  1054. 

  1055.         if (p->body_sid != body_sid)

  1056.             continue;

  1057. 

  1058.         if (!p->essence_length)

  1059.             return 0;

  1060. 

  1061.         ret = p->essence_offset + p->essence_length;

  1062.     }

  1063. 

  1064.     return ret;

  1065. }

  1066. 

  1067. /* EditUnit -> absolute offset */

  1068. static int mxf_edit_unit_absolute_offset(MXFContext *mxf, MXFIndexTable *index_table, int64_t edit_unit, int64_t *edit_unit_out, int64_t *offset_out, int nag)

  1069. {

  1070.     int i;

  1071.     int64_t offset_temp = 0;

  1072. 

  1073.     for (i = 0; i < index_table->nb_segments; i++) {

  1074.         MXFIndexTableSegment *s = index_table->segments[i];

  1075. 

  1076.         edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */

  1077. 

  1078.         if (edit_unit < s->index_start_position + s->index_duration) {

  1079.             int64_t index = edit_unit - s->index_start_position;

  1080. 

  1081.             if (s->edit_unit_byte_count)

  1082.                 offset_temp += s->edit_unit_byte_count * index;

  1083.             else if (s->nb_index_entries) {

  1084.                 if (s->nb_index_entries == 2 * s->index_duration + 1)

  1085.                     index *= 2;     /* Avid index */

  1086. 

  1087.                 if (index < 0 || index >= s->nb_index_entries) {

  1088.                     av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",

  1089.                            index_table->index_sid, s->index_start_position);

  1090.                     return AVERROR_INVALIDDATA;

  1091.                 }

  1092. 

  1093.                 offset_temp = s->stream_offset_entries[index];

  1094.             } else {

  1095.                 av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",

  1096.                        index_table->index_sid, s->index_start_position);

  1097.                 return AVERROR_INVALIDDATA;

  1098.             }

  1099. 

  1100.             if (edit_unit_out)

  1101.                 *edit_unit_out = edit_unit;

  1102. 

  1103.             return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);

  1104.         } else {

  1105.             /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */

  1106.             offset_temp += s->edit_unit_byte_count * s->index_duration;

  1107.         }

  1108.     }

  1109. 

  1110.     if (nag)

  1111.         av_log(mxf->fc, AV_LOG_ERROR, "failed to map EditUnit %"PRId64" in IndexSID %i to an offset\n", edit_unit, index_table->index_sid);

  1112. 

  1113.     return AVERROR_INVALIDDATA;

  1114. }

  1115. 

  1116. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1117. {

  1118.     int i, j, x;

  1119.     int8_t max_temporal_offset = -128;

  1120. 

  1121.     /* first compute how many entries we have */

  1122.     for (i = 0; i < index_table->nb_segments; i++) {

  1123.         MXFIndexTableSegment *s = index_table->segments[i];

  1124. 

  1125.         if (!s->nb_index_entries) {

  1126.             index_table->nb_ptses = 0;

  1127.             return 0;                               /* no TemporalOffsets */

  1128.         }

  1129. 

  1130.         index_table->nb_ptses += s->index_duration;

  1131.     }

  1132. 

  1133.     /* paranoid check */

  1134.     if (index_table->nb_ptses <= 0)

  1135.         return 0;

  1136. 

  1137.     if (index_table->nb_ptses > INT_MAX / sizeof(AVIndexEntry))

  1138.         return AVERROR(ENOMEM);

  1139. 

  1140.     index_table->ptses      = av_mallocz(index_table->nb_ptses *

  1141.                                          sizeof(int64_t));

  1142.     index_table->fake_index = av_mallocz(index_table->nb_ptses *

  1143.                                          sizeof(AVIndexEntry));

  1144.     if (!index_table->ptses || !index_table->fake_index) {

  1145.         av_freep(&index_table->ptses);

  1146.         return AVERROR(ENOMEM);

  1147.     }

  1148. 

  1149.     /* we may have a few bad TemporalOffsets

  1150.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1151.     for (x = 0; x < index_table->nb_ptses; x++)

  1152.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1153. 

  1154.     /**

  1155.      * We have this:

  1156.      *

  1157.      * x  TemporalOffset

  1158.      * 0:  0

  1159.      * 1:  1

  1160.      * 2:  1

  1161.      * 3: -2

  1162.      * 4:  1

  1163.      * 5:  1

  1164.      * 6: -2

  1165.      *

  1166.      * We want to transform it into this:

  1167.      *

  1168.      * x  DTS PTS

  1169.      * 0: -1   0

  1170.      * 1:  0   3

  1171.      * 2:  1   1

  1172.      * 3:  2   2

  1173.      * 4:  3   6

  1174.      * 5:  4   4

  1175.      * 6:  5   5

  1176.      *

  1177.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1178.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1179.      * The latter makes DTS <= PTS.

  1180.      */

  1181.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1182.         MXFIndexTableSegment *s = index_table->segments[i];

  1183.         int index_delta = 1;

  1184.         int n = s->nb_index_entries;

  1185. 

  1186.         if (s->nb_index_entries == 2 * s->index_duration + 1) {

  1187.             index_delta = 2;    /* Avid index */

  1188.             /* ignore the last entry - it's the size of the essence container */

  1189.             n--;

  1190.         }

  1191. 

  1192.         for (j = 0; j < n; j += index_delta, x++) {

  1193.             int offset = s->temporal_offset_entries[j] / index_delta;

  1194.             int index  = x + offset;

  1195. 

  1196.             if (x >= index_table->nb_ptses) {

  1197.                 av_log(mxf->fc, AV_LOG_ERROR,

  1198.                        "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",

  1199.                        s->nb_index_entries, s->index_duration);

  1200.                 break;

  1201.             }

  1202. 

  1203.             index_table->fake_index[x].timestamp = x;

  1204.             index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1205. 

  1206.             if (index < 0 || index >= index_table->nb_ptses) {

  1207.                 av_log(mxf->fc, AV_LOG_ERROR,

  1208.                        "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",

  1209.                        x, offset, index);

  1210.                 continue;

  1211.             }

  1212. 

  1213.             index_table->ptses[index] = x;

  1214.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1215.         }

  1216.     }

  1217. 

  1218.     index_table->first_dts = -max_temporal_offset;

  1219. 

  1220.     return 0;

  1221. }

  1222. 

  1223. /**

  1224.  * Sorts and collects index table segments into index tables.

  1225.  * Also computes PTSes if possible.

  1226.  */

  1227. static int mxf_compute_index_tables(MXFContext *mxf)

  1228. {

  1229.     int i, j, k, ret, nb_sorted_segments;

  1230.     MXFIndexTableSegment **sorted_segments = NULL;

  1231. 

  1232.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1233.         nb_sorted_segments <= 0) {

  1234.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1235.         return 0;

  1236.     }

  1237. 

  1238.     /* sanity check and count unique BodySIDs/IndexSIDs */

  1239.     for (i = 0; i < nb_sorted_segments; i++) {

  1240.         if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)

  1241.             mxf->nb_index_tables++;

  1242.         else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {

  1243.             av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");

  1244.             ret = AVERROR_INVALIDDATA;

  1245.             goto finish_decoding_index;

  1246.         }

  1247.     }

  1248. 

  1249.     mxf->index_tables = av_mallocz_array(mxf->nb_index_tables,

  1250.                                          sizeof(*mxf->index_tables));

  1251.     if (!mxf->index_tables) {

  1252.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1253.         ret = AVERROR(ENOMEM);

  1254.         goto finish_decoding_index;

  1255.     }

  1256. 

  1257.     /* distribute sorted segments to index tables */

  1258.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1259.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1260.             /* next IndexSID */

  1261.             j++;

  1262.         }

  1263. 

  1264.         mxf->index_tables[j].nb_segments++;

  1265.     }

  1266. 

  1267.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1268.         MXFIndexTable *t = &mxf->index_tables[j];

  1269. 

  1270.         t->segments = av_mallocz_array(t->nb_segments,

  1271.                                        sizeof(*t->segments));

  1272. 

  1273.         if (!t->segments) {

  1274.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment"

  1275.                    " pointer array\n");

  1276.             ret = AVERROR(ENOMEM);

  1277.             goto finish_decoding_index;

  1278.         }

  1279. 

  1280.         if (sorted_segments[i]->index_start_position)

  1281.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1282.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1283. 

  1284.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1285.         t->index_sid = sorted_segments[i]->index_sid;

  1286.         t->body_sid = sorted_segments[i]->body_sid;

  1287. 

  1288.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1289.             goto finish_decoding_index;

  1290. 

  1291.         /* fix zero IndexDurations */

  1292.         for (k = 0; k < t->nb_segments; k++) {

  1293.             if (t->segments[k]->index_duration)

  1294.                 continue;

  1295. 

  1296.             if (t->nb_segments > 1)

  1297.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1298.                        t->index_sid, k);

  1299. 

  1300.             if (mxf->fc->nb_streams <= 0) {

  1301.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1302.                 break;

  1303.             }

  1304. 

  1305.             /* assume the first stream's duration is reasonable

  1306.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1307.              */

  1308.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1309.             break;

  1310.         }

  1311.     }

  1312. 

  1313.     ret = 0;

  1314. finish_decoding_index:

  1315.     av_free(sorted_segments);

  1316.     return ret;

  1317. }

  1318. 

  1319. static int mxf_is_intra_only(MXFDescriptor *d)

  1320. {

  1321.     return mxf_get_codec_ul(mxf_intra_only_essence_container_uls,

  1322.                             &d->essence_container_ul)->id != AV_CODEC_ID_NONE ||

  1323.            mxf_get_codec_ul(mxf_intra_only_picture_essence_coding_uls,

  1324.                             &d->essence_codec_ul)->id     != AV_CODEC_ID_NONE;

  1325. }

  1326. 

  1327. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1328. {

  1329.     MXFPackage *material_package = NULL;

  1330.     MXFPackage *temp_package = NULL;

  1331.     int i, j, k, ret;

  1332. 

  1333.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1334.     /* TODO: handle multiple material packages (OP3x) */

  1335.     for (i = 0; i < mxf->packages_count; i++) {

  1336.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1337.         if (material_package) break;

  1338.     }

  1339.     if (!material_package) {

  1340.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1341.         return AVERROR_INVALIDDATA;

  1342.     }

  1343. 

  1344.     for (i = 0; i < material_package->tracks_count; i++) {

  1345.         MXFPackage *source_package = NULL;

  1346.         MXFTrack *material_track = NULL;

  1347.         MXFTrack *source_track = NULL;

  1348.         MXFTrack *temp_track = NULL;

  1349.         MXFDescriptor *descriptor = NULL;

  1350.         MXFStructuralComponent *component = NULL;

  1351.         UID *essence_container_ul = NULL;

  1352.         const MXFCodecUL *codec_ul = NULL;

  1353.         const MXFCodecUL *container_ul = NULL;

  1354.         const MXFCodecUL *pix_fmt_ul = NULL;

  1355.         AVStream *st;

  1356. 

  1357.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1358.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1359.             continue;

  1360.         }

  1361. 

  1362.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1363.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1364.             continue;

  1365.         }

  1366. 

  1367.         /* TODO: handle multiple source clips */

  1368.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1369.             /* TODO: handle timecode component */

  1370.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1371.             if (!component)

  1372.                 continue;

  1373. 

  1374.             for (k = 0; k < mxf->packages_count; k++) {

  1375.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1376.                 if (!temp_package)

  1377.                     continue;

  1378.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1379.                     source_package = temp_package;

  1380.                     break;

  1381.                 }

  1382.             }

  1383.             if (!source_package) {

  1384.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1385.                 break;

  1386.             }

  1387.             for (k = 0; k < source_package->tracks_count; k++) {

  1388.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1389.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1390.                     ret = AVERROR_INVALIDDATA;

  1391.                     goto fail_and_free;

  1392.                 }

  1393.                 if (temp_track->track_id == component->source_track_id) {

  1394.                     source_track = temp_track;

  1395.                     break;

  1396.                 }

  1397.             }

  1398.             if (!source_track) {

  1399.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1400.                 break;

  1401.             }

  1402.         }

  1403.         if (!source_track || !component)

  1404.             continue;

  1405. 

  1406.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1407.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1408.             ret = AVERROR_INVALIDDATA;

  1409.             goto fail_and_free;

  1410.         }

  1411. 

  1412.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1413.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1414.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1415.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1416.             continue;

  1417.         }

  1418. 

  1419.         st = avformat_new_stream(mxf->fc, NULL);

  1420.         if (!st) {

  1421.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1422.             ret = AVERROR(ENOMEM);

  1423.             goto fail_and_free;

  1424.         }

  1425.         st->id = source_track->track_id;

  1426.         st->priv_data = source_track;

  1427.         st->duration = component->duration;

  1428.         if (st->duration == -1)

  1429.             st->duration = AV_NOPTS_VALUE;

  1430.         st->start_time = component->start_position;

  1431.         if (material_track->edit_rate.num <= 0 ||

  1432.             material_track->edit_rate.den <= 0) {

  1433.             av_log(mxf->fc, AV_LOG_WARNING,

  1434.                    "Invalid edit rate (%d/%d) found on stream #%d, "

  1435.                    "defaulting to 25/1\n",

  1436.                    material_track->edit_rate.num,

  1437.                    material_track->edit_rate.den, st->index);

  1438.             material_track->edit_rate = (AVRational){25, 1};

  1439.         }

  1440.         avpriv_set_pts_info(st, 64, material_track->edit_rate.den, material_track->edit_rate.num);

  1441. 

  1442.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1443.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1444.         st->codec->codec_type = codec_ul->id;

  1445. 

  1446.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1447.         if (source_package->descriptor) {

  1448.             if (source_package->descriptor->type == MultipleDescriptor) {

  1449.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1450.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1451. 

  1452.                     if (!sub_descriptor) {

  1453.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1454.                         continue;

  1455.                     }

  1456.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1457.                         descriptor = sub_descriptor;

  1458.                         break;

  1459.                     }

  1460.                 }

  1461.             } else if (source_package->descriptor->type == Descriptor)

  1462.                 descriptor = source_package->descriptor;

  1463.         }

  1464.         if (!descriptor) {

  1465.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1466.             continue;

  1467.         }

  1468.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1469.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1470.         essence_container_ul = &descriptor->essence_container_ul;

  1471.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1472.          * is not allowed according to s429-6, try to find correct information anyway */

  1473.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1474.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1475.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1476.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1477.                 if (metadata->type == CryptoContext) {

  1478.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1479.                     break;

  1480.                 }

  1481.             }

  1482.         }

  1483. 

  1484.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1485.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1486.         st->codec->codec_id = codec_ul->id;

  1487. 

  1488.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1489.             source_track->intra_only = mxf_is_intra_only(descriptor);

  1490.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1491.             if (st->codec->codec_id == AV_CODEC_ID_NONE)

  1492.                 st->codec->codec_id = container_ul->id;

  1493.             st->codec->width = descriptor->width;

  1494.             /* Field height, not frame height */

  1495.             st->codec->height = descriptor->height;

  1496.             switch (descriptor->frame_layout) {

  1497.                 case SegmentedFrame:

  1498.                     /* This one is a weird layout I don't fully understand. */

  1499.                     av_log(mxf->fc, AV_LOG_INFO,

  1500.                            "SegmentedFrame layout isn't currently supported\n");

  1501.                     break;

  1502.                 case FullFrame:

  1503.                     st->codec->field_order = AV_FIELD_PROGRESSIVE;

  1504.                     break;

  1505.                 case OneField:

  1506.                     /* Every other line is stored and needs to be duplicated. */

  1507.                     av_log(mxf->fc, AV_LOG_INFO,

  1508.                            "OneField frame layout isn't currently supported\n");

  1509.                     break;

  1510.                     /* The correct thing to do here is fall through, but by

  1511.                      * breaking we might be able to decode some streams at half

  1512.                      * the vertical resolution, rather than not al all.

  1513.                      * It's also for compatibility with the old behavior. */

  1514.                 case SeparateFields:

  1515.                 case MixedFields:

  1516.                     switch (descriptor->field_dominance) {

  1517.                     case MXF_TFF:

  1518.                         st->codec->field_order = AV_FIELD_TT;

  1519.                         break;

  1520.                     case MXF_BFF:

  1521.                         st->codec->field_order = AV_FIELD_BB;

  1522.                         break;

  1523.                     default:

  1524.                         avpriv_request_sample(mxf->fc,

  1525.                                               "Field dominance %d support",

  1526.                                               descriptor->field_dominance);

  1527.                         break;

  1528.                     }

  1529.                     /* Turn field height into frame height. */

  1530.                     st->codec->height *= 2;

  1531.                 default:

  1532.                     av_log(mxf->fc, AV_LOG_INFO,

  1533.                            "Unknown frame layout type: %d\n",

  1534.                            descriptor->frame_layout);

  1535.             }

  1536.             if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO) {

  1537.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1538.                 if (st->codec->pix_fmt == AV_PIX_FMT_NONE) {

  1539.                     pix_fmt_ul = mxf_get_codec_ul(ff_mxf_pixel_format_uls,

  1540.                                                   &descriptor->essence_codec_ul);

  1541.                     st->codec->pix_fmt = pix_fmt_ul->id;

  1542.                     if (st->codec->pix_fmt == AV_PIX_FMT_NONE) {

  1543.                         /* support files created before RP224v10 by defaulting to UYVY422

  1544.                            if subsampling is 4:2:2 and component depth is 8-bit */

  1545.                         if (descriptor->horiz_subsampling == 2 &&

  1546.                             descriptor->vert_subsampling == 1 &&

  1547.                             descriptor->component_depth == 8) {

  1548.                             st->codec->pix_fmt = AV_PIX_FMT_UYVY422;

  1549.                         }

  1550.                     }

  1551.                 }

  1552.             }

  1553.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1554.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1555.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1556.             if (st->codec->codec_id == AV_CODEC_ID_NONE)

  1557.                 st->codec->codec_id = container_ul->id;

  1558.             st->codec->channels = descriptor->channels;

  1559.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1560. 

  1561.             if (descriptor->sample_rate.den > 0) {

  1562.                 st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1563.                 avpriv_set_pts_info(st, 64, descriptor->sample_rate.den, descriptor->sample_rate.num);

  1564.             } else {

  1565.                 av_log(mxf->fc, AV_LOG_WARNING, "invalid sample rate (%d/%d) "

  1566.                        "found for stream #%d, time base forced to 1/48000\n",

  1567.                        descriptor->sample_rate.num, descriptor->sample_rate.den,

  1568.                        st->index);

  1569.                 avpriv_set_pts_info(st, 64, 1, 48000);

  1570.             }

  1571. 

  1572.             /* TODO: implement AV_CODEC_ID_RAWAUDIO */

  1573.             if (st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) {

  1574.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1575.                     st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;

  1576.                 else if (descriptor->bits_per_sample == 32)

  1577.                     st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;

  1578.             } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) {

  1579.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1580.                     st->codec->codec_id = AV_CODEC_ID_PCM_S24BE;

  1581.                 else if (descriptor->bits_per_sample == 32)

  1582.                     st->codec->codec_id = AV_CODEC_ID_PCM_S32BE;

  1583.             } else if (st->codec->codec_id == AV_CODEC_ID_MP2) {

  1584.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1585.             }

  1586.         }

  1587.         if (descriptor->extradata) {

  1588.             st->codec->extradata = av_mallocz(descriptor->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1589.             if (st->codec->extradata) {

  1590.                 memcpy(st->codec->extradata, descriptor->extradata, descriptor->extradata_size);

  1591.                 st->codec->extradata_size = descriptor->extradata_size;

  1592.             }

  1593.         } else if (st->codec->codec_id == AV_CODEC_ID_H264) {

  1594.             ret = ff_generate_avci_extradata(st);

  1595.             if (ret < 0)

  1596.                 return ret;

  1597.         }

  1598.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1599.             /* TODO: decode timestamps */

  1600.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1601.         }

  1602.     }

  1603. 

  1604.     ret = 0;

  1605. fail_and_free:

  1606.     return ret;

  1607. }

  1608. 

  1609. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1610.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1611.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1612.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1613.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1614.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1615.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1616.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1617.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1618.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1619.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1620.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1621.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1622.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1623.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1624.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1625.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1626.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1627.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */

  1628.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1629.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1630.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */

  1631.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1632.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1633.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1634.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1635.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1636.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1637.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1638. };

  1639. 

  1640. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1641. {

  1642.     AVIOContext *pb = mxf->fc->pb;

  1643.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1644.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1645. 

  1646.     if (!ctx)

  1647.         return AVERROR(ENOMEM);

  1648.     while (avio_tell(pb) + 4 < klv_end && !pb->eof_reached) {

  1649.         int ret;

  1650.         int tag = avio_rb16(pb);

  1651.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1652.         uint64_t next = avio_tell(pb) + size;

  1653.         UID uid = {0};

  1654. 

  1655.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1656.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1657.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1658.             continue;

  1659.         }

  1660.         if (tag > 0x7FFF) { /* dynamic tag */

  1661.             int i;

  1662.             for (i = 0; i < mxf->local_tags_count; i++) {

  1663.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1664.                 if (local_tag == tag) {

  1665.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1666.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1667.                     PRINT_KEY(mxf->fc, "uid", uid);

  1668.                 }

  1669.             }

  1670.         }

  1671.         if (ctx_size && tag == 0x3C0A)

  1672.             avio_read(pb, ctx->uid, 16);

  1673.         else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)

  1674.             return ret;

  1675. 

  1676.         /* Accept the 64k local set limit being exceeded (Avid). Don't accept

  1677.          * it extending past the end of the KLV though (zzuf5.mxf). */

  1678.         if (avio_tell(pb) > klv_end) {

  1679.             if (ctx_size)

  1680.                 av_free(ctx);

  1681. 

  1682.             av_log(mxf->fc, AV_LOG_ERROR,

  1683.                    "local tag %#04x extends past end of local set @ %#"PRIx64"\n",

  1684.                    tag, klv->offset);

  1685.             return AVERROR_INVALIDDATA;

  1686.         } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */

  1687.             avio_seek(pb, next, SEEK_SET);

  1688.     }

  1689.     if (ctx_size) ctx->type = type;

  1690.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1691. }

  1692. 

  1693. /**

  1694.  * Seeks to the previous partition, if possible

  1695.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1696.  */

  1697. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1698. {

  1699.     AVIOContext *pb = mxf->fc->pb;

  1700. 

  1701.     if (!mxf->current_partition ||

  1702.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1703.         return 0;   /* we've parsed all partitions */

  1704. 

  1705.     /* seek to previous partition */

  1706.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1707.     mxf->current_partition = NULL;

  1708. 

  1709.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1710. 

  1711.     return 1;

  1712. }

  1713. 

  1714. /**

  1715.  * Called when essence is encountered

  1716.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1717.  */

  1718. static int mxf_parse_handle_essence(MXFContext *mxf)

  1719. {

  1720.     AVIOContext *pb = mxf->fc->pb;

  1721.     int64_t ret;

  1722. 

  1723.     if (mxf->parsing_backward) {

  1724.         return mxf_seek_to_previous_partition(mxf);

  1725.     } else {

  1726.         if (!mxf->footer_partition) {

  1727.             av_dlog(mxf->fc, "no footer\n");

  1728.             return 0;

  1729.         }

  1730. 

  1731.         av_dlog(mxf->fc, "seeking to footer\n");

  1732. 

  1733.         /* remember where we were so we don't end up seeking further back than this */

  1734.         mxf->last_forward_tell = avio_tell(pb);

  1735. 

  1736.         if (!pb->seekable) {

  1737.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1738.             return -1;

  1739.         }

  1740. 

  1741.         /* seek to footer partition and parse backward */

  1742.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1743.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1744.                    mxf->run_in + mxf->footer_partition, ret);

  1745.             return ret;

  1746.         }

  1747. 

  1748.         mxf->current_partition = NULL;

  1749.         mxf->parsing_backward = 1;

  1750.     }

  1751. 

  1752.     return 1;

  1753. }

  1754. 

  1755. /**

  1756.  * Called when the next partition or EOF is encountered

  1757.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1758.  */

  1759. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1760. {

  1761.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1762. }

  1763. 

  1764. /**

  1765.  * Figure out the proper offset and length of the essence container

  1766.  * in each partition

  1767.  */

  1768. static void mxf_compute_essence_containers(MXFContext *mxf)

  1769. {

  1770.     int x;

  1771. 

  1772.     /* everything is already correct */

  1773.     if (mxf->op == OPAtom)

  1774.         return;

  1775. 

  1776.     for (x = 0; x < mxf->partitions_count; x++) {

  1777.         MXFPartition *p = &mxf->partitions[x];

  1778. 

  1779.         if (!p->body_sid)

  1780.             continue;       /* BodySID == 0 -> no essence */

  1781. 

  1782.         if (x >= mxf->partitions_count - 1)

  1783.             break;          /* last partition - can't compute length (and we don't need to) */

  1784. 

  1785.         /* essence container spans to the next partition */

  1786.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1787. 

  1788.         if (p->essence_length < 0) {

  1789.             /* next ThisPartition < essence_offset */

  1790.             p->essence_length = 0;

  1791.             av_log(mxf->fc, AV_LOG_ERROR,

  1792.                    "partition %i: bad ThisPartition = %"PRIX64"\n",

  1793.                    x+1, mxf->partitions[x+1].this_partition);

  1794.         }

  1795.     }

  1796. }

  1797. 

  1798. static int64_t round_to_kag(int64_t position, int kag_size)

  1799. {

  1800.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1801.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1802.     int64_t ret = (position / kag_size) * kag_size;

  1803.     return ret == position ? ret : ret + kag_size;

  1804. }

  1805. 

  1806. static inline void compute_partition_essence_offset(AVFormatContext *s,

  1807.                                                     MXFContext *mxf,

  1808.                                                     KLVPacket *klv)

  1809. {

  1810.     MXFPartition *cur_part = mxf->current_partition;

  1811.     /* for OP1a we compute essence_offset

  1812.      * for OPAtom we point essence_offset after the KL

  1813.      *     (usually op1a_essence_offset + 20 or 25)

  1814.      * TODO: for OP1a we could eliminate this entire if statement, always

  1815.      *       stopping parsing at op1a_essence_offset

  1816.      *       for OPAtom we still need the actual essence_offset though

  1817.      *       (the KL's length can vary)

  1818.      */

  1819.     int64_t op1a_essence_offset =

  1820.         round_to_kag(cur_part->this_partition + cur_part->pack_length,

  1821.                      cur_part->kag_size) +

  1822.         round_to_kag(cur_part->header_byte_count, cur_part->kag_size) +

  1823.         round_to_kag(cur_part->index_byte_count, cur_part->kag_size);

  1824. 

  1825.     if (mxf->op == OPAtom) {

  1826.         /* point essence_offset to the actual data

  1827.          * OPAtom has all the essence in one big KLV

  1828.          */

  1829.         cur_part->essence_offset = avio_tell(s->pb);

  1830.         cur_part->essence_length = klv->length;

  1831.     } else {

  1832.         /* NOTE: op1a_essence_offset may be less than to klv.offset

  1833.          * (C0023S01.mxf)  */

  1834.         cur_part->essence_offset = op1a_essence_offset;

  1835.     }

  1836. }

  1837. 

  1838. static int is_pcm(enum AVCodecID codec_id)

  1839. {

  1840.     /* we only care about "normal" PCM codecs until we get samples */

  1841.     return codec_id >= AV_CODEC_ID_PCM_S16LE && codec_id < AV_CODEC_ID_PCM_S24DAUD;

  1842. }

  1843. 

  1844. /**

  1845.  * Deal with the case where for some audio atoms EditUnitByteCount is

  1846.  * very small (2, 4..). In those cases we should read more than one

  1847.  * sample per call to mxf_read_packet().

  1848.  */

  1849. static void mxf_handle_small_eubc(AVFormatContext *s)

  1850. {

  1851.     MXFContext *mxf = s->priv_data;

  1852. 

  1853.     /* assuming non-OPAtom == frame wrapped

  1854.      * no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */

  1855.     if (mxf->op != OPAtom)

  1856.         return;

  1857. 

  1858.     /* expect PCM with exactly one index table segment and a small (< 32) EUBC */

  1859.     if (s->nb_streams != 1                                     ||

  1860.         s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO ||

  1861.         !is_pcm(s->streams[0]->codec->codec_id)                ||

  1862.         mxf->nb_index_tables != 1                              ||

  1863.         mxf->index_tables[0].nb_segments != 1                  ||

  1864.         mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)

  1865.         return;

  1866. 

  1867.     /* arbitrarily default to 48 kHz PAL audio frame size */

  1868.     /* TODO: We could compute this from the ratio between the audio

  1869.      *       and video edit rates for 48 kHz NTSC we could use the

  1870.      *       1802-1802-1802-1802-1801 pattern. */

  1871.     mxf->edit_units_per_packet = 1920;

  1872. }

  1873. 

  1874. static int mxf_read_header(AVFormatContext *s)

  1875. {

  1876.     MXFContext *mxf = s->priv_data;

  1877.     KLVPacket klv;

  1878.     int64_t essence_offset = 0;

  1879.     int ret;

  1880. 

  1881.     mxf->last_forward_tell = INT64_MAX;

  1882.     mxf->edit_units_per_packet = 1;

  1883. 

  1884.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1885.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1886.         return AVERROR_INVALIDDATA;

  1887.     }

  1888.     avio_seek(s->pb, -14, SEEK_CUR);

  1889.     mxf->fc = s;

  1890.     mxf->run_in = avio_tell(s->pb);

  1891. 

  1892.     while (!s->pb->eof_reached) {

  1893.         const MXFMetadataReadTableEntry *metadata;

  1894. 

  1895.         if (klv_read_packet(&klv, s->pb) < 0) {

  1896.             /* EOF - seek to previous partition or stop */

  1897.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1898.                 break;

  1899.             else

  1900.                 continue;

  1901.         }

  1902. 

  1903.         PRINT_KEY(s, "read header", klv.key);

  1904.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1905.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1906.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1907.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  1908.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1909. 

  1910.             if (!mxf->current_partition) {

  1911.                 av_log(mxf->fc, AV_LOG_ERROR,

  1912.                        "found essence prior to first PartitionPack\n");

  1913.                 return AVERROR_INVALIDDATA;

  1914.             }

  1915. 

  1916.             if (!mxf->current_partition->essence_offset) {

  1917.                 compute_partition_essence_offset(s, mxf, &klv);

  1918.             }

  1919. 

  1920.             if (!essence_offset)

  1921.                 essence_offset = klv.offset;

  1922. 

  1923.             /* seek to footer, previous partition or stop */

  1924.             if (mxf_parse_handle_essence(mxf) <= 0)

  1925.                 break;

  1926.             continue;

  1927.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1928.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1929.             /* next partition pack - keep going, seek to previous partition or stop */

  1930.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1931.                 break;

  1932.             else if (mxf->parsing_backward)

  1933.                 continue;

  1934.             /* we're still parsing forward. proceed to parsing this partition pack */

  1935.         }

  1936. 

  1937.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1938.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1939.                 int res;

  1940.                 if (klv.key[5] == 0x53) {

  1941.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1942.                 } else {

  1943.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1944.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1945. 

  1946.                     /* only seek forward, else this can loop for a long time */

  1947.                     if (avio_tell(s->pb) > next) {

  1948.                         av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",

  1949.                                klv.offset);

  1950.                         return AVERROR_INVALIDDATA;

  1951.                     }

  1952. 

  1953.                     avio_seek(s->pb, next, SEEK_SET);

  1954.                 }

  1955.                 if (res < 0) {

  1956.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1957.                     return res;

  1958.                 }

  1959.                 break;

  1960.             }

  1961.         }

  1962.         if (!metadata->read)

  1963.             avio_skip(s->pb, klv.length);

  1964.     }

  1965.     /* FIXME avoid seek */

  1966.     if (!essence_offset)  {

  1967.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1968.         return AVERROR_INVALIDDATA;

  1969.     }

  1970.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1971. 

  1972.     mxf_compute_essence_containers(mxf);

  1973. 

  1974.     /* we need to do this before computing the index tables

  1975.      * to be able to fill in zero IndexDurations with st->duration */

  1976.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  1977.         return ret;

  1978. 

  1979.     if ((ret = mxf_compute_index_tables(mxf)) < 0)

  1980.         return ret;

  1981. 

  1982.     if (mxf->nb_index_tables > 1) {

  1983.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  1984.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  1985.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  1986.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  1987.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  1988.         return AVERROR_INVALIDDATA;

  1989.     }

  1990. 

  1991.     mxf_handle_small_eubc(s);

  1992. 

  1993.     return 0;

  1994. }

  1995. 

  1996. /**

  1997.  * Sets mxf->current_edit_unit based on what offset we're currently at.

  1998.  * @return next_ofs if OK, <0 on error

  1999.  */

  2000. static int64_t mxf_set_current_edit_unit(MXFContext *mxf, int64_t current_offset)

  2001. {

  2002.     int64_t last_ofs = -1, next_ofs = -1;

  2003.     MXFIndexTable *t = &mxf->index_tables[0];

  2004. 

  2005.     /* this is called from the OP1a demuxing logic, which means there

  2006.      * may be no index tables */

  2007.     if (mxf->nb_index_tables <= 0)

  2008.         return -1;

  2009. 

  2010.     /* find mxf->current_edit_unit so that the next edit unit starts ahead

  2011.      * of current_offset */

  2012.     while (mxf->current_edit_unit >= 0) {

  2013.         if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1,

  2014.                                           NULL, &next_ofs, 0) < 0)

  2015.             return -1;

  2016. 

  2017.         if (next_ofs <= last_ofs) {

  2018.             /* large next_ofs didn't change or current_edit_unit wrapped

  2019.              * around this fixes the infinite loop on zzuf3.mxf */

  2020.             av_log(mxf->fc, AV_LOG_ERROR,

  2021.                    "next_ofs didn't change. not deriving packet timestamps\n");

  2022.             return -1;

  2023.         }

  2024. 

  2025.         if (next_ofs > current_offset)

  2026.             break;

  2027. 

  2028.         last_ofs = next_ofs;

  2029.         mxf->current_edit_unit++;

  2030.     }

  2031. 

  2032.     /* not checking mxf->current_edit_unit >= t->nb_ptses here since CBR files

  2033.      * may lack IndexEntryArrays */

  2034.     if (mxf->current_edit_unit < 0)

  2035.         return -1;

  2036. 

  2037.     return next_ofs;

  2038. }

  2039. 

  2040. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  2041. {

  2042.     KLVPacket klv;

  2043.     MXFContext *mxf = s->priv_data;

  2044. 

  2045.     while (!s->pb->eof_reached) {

  2046.         if (klv_read_packet(&klv, s->pb) < 0)

  2047.             return -1;

  2048.         PRINT_KEY(s, "read packet", klv.key);

  2049.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  2050.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  2051.             int res = mxf_decrypt_triplet(s, pkt, &klv);

  2052.             if (res < 0) {

  2053.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  2054.                 return -1;

  2055.             }

  2056.             return 0;

  2057.         }

  2058.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  2059.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  2060.             int index = mxf_get_stream_index(s, &klv);

  2061.             int64_t next_ofs, next_klv;

  2062.             AVStream *st;

  2063.             MXFTrack *track;

  2064. 

  2065.             if (index < 0) {

  2066.                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

  2067.                 goto skip;

  2068.             }

  2069. 

  2070.             st = s->streams[index];

  2071.             track = st->priv_data;

  2072. 

  2073.             if (s->streams[index]->discard == AVDISCARD_ALL)

  2074.                 goto skip;

  2075. 

  2076.             next_klv = avio_tell(s->pb) + klv.length;

  2077.             next_ofs = mxf_set_current_edit_unit(mxf, klv.offset);

  2078. 

  2079.             if (next_ofs >= 0 && next_klv > next_ofs) {

  2080.                 /* if this check is hit then it's possible OPAtom was treated

  2081.                  * as OP1a truncate the packet since it's probably very large

  2082.                  * (>2 GiB is common) */

  2083.                 avpriv_request_sample(s,

  2084.                                       "OPAtom misinterpreted as OP1a?"

  2085.                                       "KLV for edit unit %i extending into "

  2086.                                       "next edit unit",

  2087.                                       mxf->current_edit_unit);

  2088.                 klv.length = next_ofs - avio_tell(s->pb);

  2089.             }

  2090. 

  2091.             /* check for 8 channels AES3 element */

  2092.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  2093.                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {

  2094.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  2095.                     return -1;

  2096.                 }

  2097.             } else {

  2098.                 int ret = av_get_packet(s->pb, pkt, klv.length);

  2099.                 if (ret < 0)

  2100.                     return ret;

  2101.             }

  2102.             pkt->stream_index = index;

  2103.             pkt->pos = klv.offset;

  2104. 

  2105.             if (s->streams[index]->codec->codec_type == AVMEDIA_TYPE_VIDEO && next_ofs >= 0) {

  2106.                 /* mxf->current_edit_unit good - see if we have an

  2107.                  * index table to derive timestamps from */

  2108.                 MXFIndexTable *t = &mxf->index_tables[0];

  2109. 

  2110.                 if (mxf->nb_index_tables >= 1 &&

  2111.                     mxf->current_edit_unit < t->nb_ptses) {

  2112.                     pkt->dts = mxf->current_edit_unit + t->first_dts;

  2113.                     pkt->pts = t->ptses[mxf->current_edit_unit];

  2114.                 } else if (track->intra_only) {

  2115.                     /* intra-only -> PTS = EditUnit.

  2116.                      * let utils.c figure out DTS since it can be

  2117.                      * < PTS if low_delay = 0 (Sony IMX30) */

  2118.                     pkt->pts = mxf->current_edit_unit;

  2119.                 }

  2120.             }

  2121. 

  2122.             /* seek for truncated packets */

  2123.             avio_seek(s->pb, next_klv, SEEK_SET);

  2124. 

  2125.             return 0;

  2126.         } else

  2127.         skip:

  2128.             avio_skip(s->pb, klv.length);

  2129.     }

  2130.     return AVERROR_EOF;

  2131. }

  2132. 

  2133. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  2134. {

  2135.     MXFContext *mxf = s->priv_data;

  2136.     int ret, size;

  2137.     int64_t ret64, pos, next_pos;

  2138.     AVStream *st;

  2139.     MXFIndexTable *t;

  2140.     int edit_units;

  2141. 

  2142.     if (mxf->op != OPAtom)

  2143.         return mxf_read_packet_old(s, pkt);

  2144. 

  2145.     /* OPAtom - clip wrapped demuxing */

  2146.     /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */

  2147.     st = s->streams[0];

  2148.     t = &mxf->index_tables[0];

  2149. 

  2150.     if (mxf->current_edit_unit >= st->duration)

  2151.         return AVERROR_EOF;

  2152. 

  2153.     edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);

  2154. 

  2155.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)

  2156.         return ret;

  2157. 

  2158.     /* compute size by finding the next edit unit or the end of the essence container

  2159.      * not pretty, but it works */

  2160.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&

  2161.         (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {

  2162.         av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");

  2163.         return AVERROR_INVALIDDATA;

  2164.     }

  2165. 

  2166.     if ((size = next_pos - pos) <= 0) {

  2167.         av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);

  2168.         return AVERROR_INVALIDDATA;

  2169.     }

  2170. 

  2171.     if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)

  2172.         return ret64;

  2173. 

  2174.         if ((ret = av_get_packet(s->pb, pkt, size)) != size)

  2175.             return ret < 0 ? ret : AVERROR_EOF;

  2176. 

  2177.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&

  2178.         mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {

  2179.         pkt->dts = mxf->current_edit_unit + t->first_dts;

  2180.         pkt->pts = t->ptses[mxf->current_edit_unit];

  2181.     }

  2182. 

  2183.     pkt->stream_index = 0;

  2184.     mxf->current_edit_unit += edit_units;

  2185. 

  2186.     return 0;

  2187. }

  2188. 

  2189. 

  2190. static int mxf_read_close(AVFormatContext *s)

  2191. {

  2192.     MXFContext *mxf = s->priv_data;

  2193.     MXFIndexTableSegment *seg;

  2194.     int i;

  2195. 

  2196.     av_freep(&mxf->packages_refs);

  2197. 

  2198.     for (i = 0; i < s->nb_streams; i++)

  2199.         s->streams[i]->priv_data = NULL;

  2200. 

  2201.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  2202.         switch (mxf->metadata_sets[i]->type) {

  2203.         case Descriptor:

  2204.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->extradata);

  2205.             break;

  2206.         case MultipleDescriptor:

  2207.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  2208.             break;

  2209.         case Sequence:

  2210.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  2211.             break;

  2212.         case SourcePackage:

  2213.         case MaterialPackage:

  2214.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  2215.             break;

  2216.         case IndexTableSegment:

  2217.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  2218.             av_freep(&seg->temporal_offset_entries);

  2219.             av_freep(&seg->flag_entries);

  2220.             av_freep(&seg->stream_offset_entries);

  2221.             break;

  2222.         default:

  2223.             break;

  2224.         }

  2225.         av_freep(&mxf->metadata_sets[i]);

  2226.     }

  2227.     av_freep(&mxf->partitions);

  2228.     av_freep(&mxf->metadata_sets);

  2229.     av_freep(&mxf->aesc);

  2230.     av_freep(&mxf->local_tags);

  2231. 

  2232.     for (i = 0; i < mxf->nb_index_tables; i++) {

  2233.         av_freep(&mxf->index_tables[i].segments);

  2234.         av_freep(&mxf->index_tables[i].ptses);

  2235.         av_freep(&mxf->index_tables[i].fake_index);

  2236.     }

  2237.     av_freep(&mxf->index_tables);

  2238. 

  2239.     return 0;

  2240. }

  2241. 

  2242. static int mxf_probe(AVProbeData *p) {

  2243.     uint8_t *bufp = p->buf;

  2244.     uint8_t *end = p->buf + p->buf_size;

  2245. 

  2246.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  2247.         return 0;

  2248. 

  2249.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  2250.     end -= sizeof(mxf_header_partition_pack_key);

  2251.     for (; bufp < end; bufp++) {

  2252.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  2253.             return AVPROBE_SCORE_MAX;

  2254.     }

  2255.     return 0;

  2256. }

  2257. 

  2258. /* rudimentary byte seek */

  2259. /* XXX: use MXF Index */

  2260. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  2261. {

  2262.     AVStream *st = s->streams[stream_index];

  2263.     int64_t seconds;

  2264.     MXFContext* mxf = s->priv_data;

  2265.     int64_t seekpos;

  2266.     int ret;

  2267.     MXFIndexTable *t;

  2268. 

  2269.     if (mxf->nb_index_tables <= 0) {

  2270.     if (!s->bit_rate)

  2271.         return AVERROR_INVALIDDATA;

  2272.     if (sample_time < 0)

  2273.         sample_time = 0;

  2274.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  2275. 

  2276.     seekpos = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  2277.     if (seekpos < 0)

  2278.         return seekpos;

  2279. 

  2280.     ff_update_cur_dts(s, st, sample_time);

  2281.     mxf->current_edit_unit = sample_time;

  2282.     } else {

  2283.         t = &mxf->index_tables[0];

  2284. 

  2285.         /* clamp above zero, else ff_index_search_timestamp() returns negative

  2286.          * this also means we allow seeking before the start */

  2287.         sample_time = FFMAX(sample_time, 0);

  2288. 

  2289.         if (t->fake_index) {

  2290.             /* behave as if we have a proper index */

  2291.             if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)

  2292.                 return sample_time;

  2293.         } else {

  2294.             /* no IndexEntryArray (one or more CBR segments)

  2295.              * make sure we don't seek past the end */

  2296.             sample_time = FFMIN(sample_time, st->duration - 1);

  2297.         }

  2298. 

  2299.         if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)

  2300.             return ret;

  2301. 

  2302.         ff_update_cur_dts(s, st, sample_time);

  2303.         mxf->current_edit_unit = sample_time;

  2304.         avio_seek(s->pb, seekpos, SEEK_SET);

  2305.     }

  2306.     return 0;

  2307. }

  2308. 

  2309. AVInputFormat ff_mxf_demuxer = {

  2310.     .name           = "mxf",

  2311.     .long_name      = NULL_IF_CONFIG_SMALL("MXF (Material eXchange Format)"),

  2312.     .priv_data_size = sizeof(MXFContext),

  2313.     .read_probe     = mxf_probe,

  2314.     .read_header    = mxf_read_header,

  2315.     .read_packet    = mxf_read_packet,

  2316.     .read_close     = mxf_read_close,

  2317.     .read_seek      = mxf_read_seek,

  2318. };